Vitamins are considered Goryeo Eundan.

It's a well-known vitamin that you can't go wrong with; if you're deficient, you're exposed to various diseases, so you must take it regularly. There are many vitamin supplements, but I recommend eating tangerines or fruits rather than just taking multivitamins. Since you also need to fill in the deficiencies, consider the vitamin products advertised by Jae-seok hyung from Koryoen Dan.